Statistical Analysis of the Relationship between Parameters, Related to Potato Resistance to Biotic and Abiotic Stress: The State of the Pro-/Antioxidant System and the Level of PR-Proteins Gene Expression.

Correlation analysis was used to assess the level of correlation between plant resistance to late blight and the content and activity of components of the antioxidant system and protective proteins in plants grown under conditions of lack of moisture and under normal conditions. A direct relationship between the degree of plant damage and the expression level of the proline synthase gene, which, in addition to hydrolase inhibitors, is obviously one of the indicators of plant stress, has been revealed. In general, the expression levels of the proline synthase and PR-6 genes, as well as antihydrolytic activity in leaves, show the most pronounced relationship between themselves and with the degree of plant damage. Also, according to the results of factor analysis, the level of expression of methyltransferase, the activity of peroxidase and cellulase are interrelated. Various treatment options with bacteria and their mixtures with signaling molecules had a similar effect on the activity of protease and amylase inhibitors, as well as the expression level of PR-1, PR-5, PR-6 and proline synthase genes both during phytophthora infection and under conditions of lack of moisture. The expression levels of PR-5, proline synthase, and the activity of amylase inhibitors showed similar changes under the appropriate treatments also under normal conditions; apparently, the change in these indicators is a manifestation of universal plant reactions to treatment with bacteria and signaling molecules. It can be concluded that the expression of genes and the subsequent manifestation of the activity of protease inhibitors, as well as the expression of the gene of the main antimicrobial protein, can be considered as common ways to implement plant resistance, activated under the influence of treatment by bacteria and signaling molecules, both under abiotic and biotic stress. [ABSTRACT FROM AUTHOR]